TY  - JOUR
AU  - Casas, J. A.
AU  - Gomez Vargas, G. A.
AU  - Moreno, J. M.
AU  - Quilis, J.
AU  - Ruiz de Austri, R.
PY  - 2018
DA  - 2018//
TI  - Extended Higgs-portal dark matter and the Fermi-LAT Galactic Center Excess
T2  - J. Cosmol. Astropart. Phys.
JO  - Journal of Cosmology and Astroparticle Physics
SP  - 031
EP  - 16pp
VL  - 06
IS  - 6
PB  - Iop Publishing Ltd
KW  - dark matter theory
KW  - dark matter experiments
AB  - In the present work, we show that the Galactic Center Excess (GCE) emission, as recently updated by the Fermi-LAT Collaboration, could be explained by a mixture of Fermi bubbles-like emission plus dark matter (DM) annihilation, in the context of a scalar-singlet Higgs portal scenario (SHP). In fact, the standard SHP, where the DM particle, S, only has renormalizable interactions with the Higgs, is non-operational due to strong constraints, especially from DM direct detection limits. Thus we consider the most economical extension, called ESHP (for extended SHP), which consists solely in the addition of a second (more massive) scalar singlet in the dark sector. The second scalar can be integrated-out, leaving a standard SHP plus a dimension-6 operator. Mainly, this model has only two relevant parameters (the DM mass and the coupling of the dim-6 operator). DM annihilation occurs mainly into two Higgs bosons, SS -> hh. We demonstrate that, despite its economy, the ESHP model provides an excellent fit to the GCE (with p-value similar to 0.6-0.7) for very reasonable values of the parameters, in particular, ms similar or equal to 130 GeV. This agreement of the DM candidate to the GCE properties does not clash with other observables and keep the S – particle relic density at the accepted value for the DM content in the universe.
SN  - 1475-7516
UR  - http://arxiv.org/abs/1711.10957
UR  - https://doi.org/10.1088/1475-7516/2018/06/031
DO  - 10.1088/1475-7516/2018/06/031
LA  - English
N1  - WOS:000435710700001
ID  - Casas_etal2018
ER  -